By Andrew J. Barker
Structured within the type of a dichotomous key, reminiscent of these accepted in botany, the mineral key offers an effi cient and systematic method of selecting rock-forming minerals in thin-section. This new angle covers a hundred and fifty+ of the main typically encountered rock-forming minerals, plus a couple of rarer yet noteworthy ones. Illustrated in complete color, with 330+ prime quality mineral photomicrographs from a world selection of igneous, metamorphic, and sedimentary rocks, it additionally presents a entire atlas of rock-forming minerals in thin-section.
Commencing with a short creation to mineral platforms, and the houses of minerals in plane-polarised and cross-polarised mild, the mineral key additionally comprises line drawings, tables of mineral houses and an interference color chart, to extra reduction mineral id. To minimise the opportunity of misidentification, and let much less skilled petrologists to exploit the main with self belief, the main has been prepared to prioritise these homes which are most simply recognised.
Designed for simplicity and straightforwardness of use, it's essentially aimed toward undergraduate and postgraduate scholars of mineralogy and petrology, yet also needs to supply a worthwhile resource of reference for all practicing geologists facing rock thinsections and their interpretation.
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Extra info for A key for identification of rock-forming minerals in thin-section
Not blue/violet pleochroism 10 Colourless/lavender blue pleochroism; GLAUCOPHANE/CROSSITE(◻) PPL Glaucophane (end and side- sections) in glaucophane schist (blueschist); Ile de Groix, Brittany, France. PPL 82 RIEBECKITE(◻) x100 Rbk Riebeckite (end-section) in sodic granite; Drammen, Norway. 10 11 Section 1: 2 (or 3) cleavage traces 39 11 Green, yellow-green, blue-green pleochroism Brown, greenish brown, yellow-brn, red-brown pleochroism 12 13 12 Typical amphibole 6-sided diamond-shaped end-section (1e) well developed cleavage.
Grn. to brownish pleochr. 2nd ord. blue to bright green interf. 029). Typical pyroxene of andesites and dacites. PIGEONITE( ◻ ) PPL Pigeonite (end-section) in andesitic pitchstone; Ardnamurchan, Scotland. x100 109 2V 56–84°; weak c’less to pale grn. pleochr. 1st ord. orange to 2nd ord. bright grn. iterf. 028). Typical pyroxene of eclogites. OMPHACITE( ◻ ) PPL An Fe-rich omphacite (end-section, with slight green to colourless pleochroism) with quartz and rutile in eclogite; Totaig, Glenelg, Scotland.
2V = 44–90°. brown HORNBLENDE (Oxo-HORNBLENDE)(◻) PPL Oxo-hornblende phenocryst in andesite; Plomb du Cantal, France. x100 85 Note: The black iron-oxides often seen around the edge of Oxo-hornblendes result from resorption effects. , 2013). -brn to red-brn. pleochrosim. 2V = 74–82°. KAERSUTITE(◻) (previously called BARKEVIKITE) PPL Kaersutite phenocrysts in syenogabbro (“lugarite”); Lugar Sill, Lugar, Ayrshire, Scotland. -green-blue-grn. However, high temperature hornblendes may be green to brown, or brown pleochroic.
A key for identification of rock-forming minerals in thin-section by Andrew J. Barker